Fin nosed tuyere



Patented Nov. 8, 1932 UNITED ST TES not 1:. Lanna-ma, or ramrmn,

rm no snn mums Aiiplication fled November 1a, 1928. 52ml Io. 818,757.

1 had fused with furnace slag or are frequently broken by falling particles and the metallicparts of the tuyere are exposed to the destruc tive action of the furnace burden and frequent replacements are necessitated.

My improved tu ere overcomes these objections and provi es an article which prac- ,tice has shown has greatly increased life over tuyeres hertofore used and the tuyere can be produced at a comparatively small cost as I compared with tuyeres having refractory linings and the like.

An. embodiment of the invention is illustrated in the accompanying drawing, where- Fig. 1 is a longitudinal section exemplifying one embodiment of the invention;

Fig. 2 is a view from the right side of Fig. 1.

Referring in detail to the drawing, thetu yere consists of a copper casting having an ;outer annular shell 10, an inner shell 12 an outer end wall 14 and an inner end wall 16 forming a chamber 18 adapted to have a cooling medium such as water circulated therethrough. .The outer wall 14 is provided with threa ed openings 20 and 22 or the recap tion of pipes for circulating the cooling me- At the end of the tuyere which is adapted to project into the blast furnace, I provide a plurality of spaced annularlongitudinally extending 'l'lbS 24, these ribs are cooled by water in the chamber and thus rovide an end of the tuyere which'resists t e tern rature within the furnace. The ribs be i a burned ofi slightly on their expoud edges form ed therein and havin until they become so short that the cooling effect of the water balances the heating e fect of the gases within the furnace, after which they will remain as a permanent protection to the end of the tuyere. They are no placed so close together that they protect the end wall 16 from excessive heating. These projecting cool ribs also intercept the hot dripping iron and thus serve to protect the wall 16 against the destructive action of: such hot metal.

While I have shown in the drawing only three fins and while these have been shown of circular or annular form, it. is to-be understood that a eater or fewer number of B0 fins may be use and that instead of being annular in form, they may be corrugated or z g-aagged so as to provide an extended heat dissipating surface.

.Various other modifications may be made by those skilled in the art without departure from the invention as defined in the appended claims.

What-I claim is V 1. blast furnace tuyere comprisin a metalhc body having a cooling cham er a nose ortion compr sing a plurality o fins wit open spaces between them extending beyond the end of the cooling chamber.

2. blast furnace tuyere comprisin a. metalhc body having a cooling cham r formed therein and having a nose portion comprlsmg a plurality of annular fins with open spaces between them extending beyond the end of the cooling chamber.

3. A blast furnace tuyeie comprising a hollow copper body having a plurality of longitudinally extending integral fins with open spaces between them-formed on the inner end ,of the tuyere body. 7

4. A blast furnace tuyere comprising a metallic body having a cooling chamber formed therein and having a nose portion comprising spaced fins beyond the u end of the cooling chamber with open spaces between said fins.

5. A blast furnace tuyre comprising a. metallic body having a cooling chamber formed therein and having a nose portion comprising an outer annular fin, an inner annular fin and intermediate fin separated from the outer and inner fins by open spaces. In witness whereof, I have hereunto signed my name.

ROY H. LEDBETTER. 

